14... b7c8 [%c_effect c8;square;c8;type;GreatFind;persistent;true] Carlsen also plays this important defensive move, countering a knight jump to f5. 15. f1e3  15... c8e6  16. e3f5 This move has never been played in this position (although there will be a transposition of moves later in the game). 16... a5c6 